Federal investigation into classified docs leak heats up as U.S., allies race to contain fallout

The Pentagon, Justice Department and other arms of the federal government scrambled Monday to track down the source of a major classified documents leak and to limit the widening fallout in the U.S. and in allied capitals around the world, from Jerusalem to Seoul.

The collateral damage from the leak — one of the most serious disclosures of sensitive information in years — has quickly spread far beyond American shores. Biden administration officials said they’re in contact with allies amid signs that the individuals behind the leak are intentionally trying...